/Engine/Plugins/Developer/Concert/ConcertMain/Source/Concert/Public/ConcertMessageData.h
[EConcertCompressionDetails](API\Plugins\Concert\EConcertCompressionDetails) & operator&= ( [EConcertCompressionDetails](API\Plugins\Concert\EConcertCompressionDetails) & Lhs, [EConcertCompressionDetails](API\Plugins\Concert\EConcertCompressionDetails) Rhs )